在Python中，如何在同一文件夹中定义的类中的__init__.py中调用函数

Question

I have a python package

- my_package
  - __init__.py
       # inside
       def getSingleton()  # gets an instance of an object in the package
  - AClass.py
       # inside
       class AClass:
           ...
           def instanceMathod(self,arg):
              singleton = (parent package).getSingleton()

I want to use the module "static" functions from within class instances from the module ie: reference the parent module from a contained class instance? Can one do this? Is there a better way? Much works well as the singleton will be destroyed when the containing module is destroyed when all importing modules have been destroyed. I'm using python3

Answer 1

Use:

def instanceMethod(self,arg):
    from . import getSingleton
    singleton = getSingleton()

Here we are deferring the import until the method is called, rather than importing at global scope, in case mypackage.__init__ is also importing AClass